A day earlier, another so-called duck boat burst into flames in Oahu, seriously burning a 67-year-old employee of Hawaii Duck Tours.
Unfortunately, these accidents are just the latest in a series of duck boat mishaps.
Duck boat accident history
In 1999, 13 people were killed in a duck boat accident in Arkansas.
In 2002, four people drowned in Canada when their duck boat suddenly sank.
What is a duck boat?
They are amphibious crafts that were first manufactured for use in World War II by General Motors (the boat's name derives from its military designation, "DUKW"). Since that time, they have been adapted as tour vehicles in cities that border bodies of water.
In addition to a bus license, the operator of a duck boat must also have a passenger-use boat license.
Who owns duck boats?
Surge Desk dug up an ad for "Ride the Ducks," a tour company that operates in several U.S. cities, and whose boats include the one that was rammed in Philadelphia.